SubsamplingScaleImageView.java 文件源码

/**
 * Converts source rectangle from tile, which treats the image file as if it were in the correct orientation already,
 * to the rectangle of the image that needs to be loaded.
 */
@SuppressWarnings("SuspiciousNameCombination")
@AnyThread
private void fileSRect(Rect sRect, Rect target) {
    if (getRequiredRotation() == 0) {
        target.set(sRect);
    } else if (getRequiredRotation() == 90) {
        target.set(sRect.top, sHeight - sRect.right, sRect.bottom, sHeight - sRect.left);
    } else if (getRequiredRotation() == 180) {
        target.set(sWidth - sRect.right, sHeight - sRect.bottom, sWidth - sRect.left, sHeight - sRect.top);
    } else {
        target.set(sWidth - sRect.bottom, sRect.left, sWidth - sRect.top, sRect.right);
    }
}